Currently, I can only select contacts who are part of a list - I can then qualify it further by contacts who have specific flags set.
The system should be modified to allow you to include contacts based on, not only the presence of a flag, but also the absence of a flag.
e.g. send this to everyone on the Students list who DOES NOT have the flag AttendedCourse101 but DOES have the flag CommuterStudent.
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